Walk into any coating production workshop, and you will find pumping equipment running through almost the entire process flow—from raw material feeding, dispersion and grinding, paint mixing and filtration, to finished product filling; pumps are indispensable everywhere. Yet it is precisely this seemingly basic link that often becomes the source of production bottlenecks. Choosing the wrong pump type or mismatched materials can, at best, lead to frequent shutdowns for maintenance, and at worst, result in product scrappage and even safety hazards.

-Bonve Pump Coating Delivery Rotary Lobe Pump-

The complexity of coating media far exceeds that of ordinary fluid delivery scenarios. Take viscosity as an example: the rheological properties of different formulations vary enormously, from aqueous dispersions of several hundred centipoise to high-viscosity pastes exceeding 2,500,000 centipoise—a span of thousands of times. In terms of solids content, the mass proportion of pigments and fillers in some formulations can reach up to 70%, among which components such as titanium dioxide, carbon black, and metal oxides all possess strong abrasiveness. Meanwhile, the ketones, esters, and aromatic compounds contained in solvent-based coatings pose a continuous challenge to the chemical stability of pump internal components.

Specifically, production lines mainly face four types of typical problems. The delivery efficiency of high-viscosity media is the foremost issue: ordinary centrifugal pumps experience a sharp decline in efficiency under high-viscosity conditions, and may even fail to operate normally. Second is seal failure and material swelling caused by chemical corrosion—elastomer components degrade in performance after prolonged contact with solvents, and the risk of leakage rises accordingly. Third is component wear caused by high solids content and abrasive particles, as pigment particles continuously scour the pump chamber and rotors during flow, shortening service life. Finally, there is the difficulty of cleaning during formulation changes: residual material not only affects the color of the next batch of product, but may also deposit and agglomerate inside the pump chamber.

To address these pain points, the industry generally adopts cam rotary lobe pumps as the core delivery equipment. These pumps feature strong self-priming capability, smooth delivery, and a wide viscosity adaptation range, making them well-suited to handle the variable operating conditions in coating production.

In terms of material selection, metal pump bodies are the fundamental solution to the challenges of high solids content and abrasion. Pump bodies made of aluminum alloy and stainless steel feature robust structures and excellent dimensional stability, capable of withstanding harsh operating conditions such as intermittent dry running and back pressure fluctuations. The simple structural design reduces the number of moving parts, lowering leakage risk points at the source. Meanwhile, metal structures are less prone to deformation during long-term operation, helping to extend the replacement cycle of wearing parts, and some properly configured rotary lobe pumps can reach a service life of up to 20 years.

For the chemical corrosion problem of solvent-based coatings, the solution must start with elastomer materials. Different materials such as EPDM, NBR, FKM, and PTFE each have their corresponding chemical compatibility ranges. Among them, PTFE and its modified material PTFE TFM™ 1705b are widely used in the coating industry due to their excellent chemical resistance. These materials have smooth surfaces and are non-adhesive, reducing the accumulation of pigments and resins inside the pump chamber.

The composite structural design of rotary lobe pumps further enhances durability. A built-in lightweight metal support core and fabric reinforcement layer ensure strength, while the outer PTFE material provides a sealed liquid-contact surface. Particularly with PTFE TFM™ 1705b, its mechanical strength is superior to ordinary PTFE, with less deformation under load and better flex fatigue resistance. Its lower porosity and solvent permeability enable it to effectively reduce swelling and contamination risks when handling ketone or ester-based coatings, maintaining dimensional stability and consistent flow output.

In terms of cleaning convenience, the PTFE coating on the surface of aluminum alloy pump bodies is a practical improvement measure. The coating forms a chemically resistant and non-adhesive surface, reducing the adhesion of high-solids media to the inner wall of the pump body and lowering the possibility of accumulation and clogging. For production lines that require frequent formulation changes, this means significantly improved changeover and cleaning efficiency, as well as reduced cross-contamination risks between water-based and solvent-based paints, and between different color batches. At the same time, the coating also protects the pump body from erosion by corrosive solvents, helping to maintain stable flow and reduce mechanical wear when delivering abrasive pigments such as titanium dioxide or iron oxide.

In summary, pump selection in the coating industry is not simply a matter of parameter matching, but a systematic engineering task that requires comprehensive consideration of media characteristics, process conditions, and long-term operating costs. The reasonable configuration of every link directly affects the final usage effect. Choosing a supplier capable of flexible customized solutions and providing targeted configurations based on specific operating conditions is the real key to solving the three major challenges of viscosity, corrosion, and abrasion.

Bonve pump always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

Service Hotline: 0574-87588986 13586591794  

Official Website: www.bvpumps.com  

Business Email: market@bonvepumps.com  

We look forward to working with you to drive efficiency and innovation in industrial fluid transmission with precision technology.